Log-loading boom.



A. OPSAL.

LOG LOADING BOOM. APPLICATION FILED 111N529. 1918.

Patented Sept. 24, 1918.

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LOG LOADING BOOM. APPLICATION FILED JUNE 29, 1918.

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,, ,a NDRnworsA or YANCQJIVER, BRITISH COLUMBIA, CANADA.

' Be itknown that I, AN DREWOPSAL, a citizen of the Unit-ed States, residin at Vancouver-in the province of British olumbia, Canada have invented certain new and useful Improvements in Log-Loading Booms, of whichthe folldwving isa specifioaton.

This invention-relates to an improvement in a logdoadi'ng boom such as is used for transferring logs from a log pile to a railway car .or platform, and in the manner for rigging the same to enable the work to be done more'expediitiously and more safely, both'for the life and limb of the operators and for the rolling stock on which the logs be adjusted. to be parallel with the track on which is the car to be loaded the-sheaves on the boom over which the two lifting lines pass are carried-on offsets disposed across the boom. While this is a valuable improvement over the former system of single line loading,- it imposes a heavy twist on the logs are lifted and are checked against spin ning, are usually connected to one lifting boomstick and .its' several connections to the spar pole! Further The separate lines by which the line before passing overthe sheave on the spar pole to the drum of the donkeyengine, so that while the-logs may be lifted within a limited range from a log pile and swung onto a car there is little range of movement aboutitsspar pole. I provide two boom of the line enabling a log to be dragged from any distance and lifted.

Insteadof using a horizontally disposed single boom stick mounted to swing radially sticks secured-together to be substantially parallel to one another. The outer ends of these boom sticks are, maintained the requir'ed.,distance apart by two transverse cross-members, and the lnner ends are.

stepped into and seci'ired 'to a pivot casting mounted on the span pole to swing around Specification of Letters Patent.

LOG-LOADING BOOM.

Patented Sept.) 24, 1918;

Application filed June'29, 1918. Serial It 0. 242,575.

the same through any desired angle. On the transverse members of the boom the sheaves around which the lifting lines pass for (now nection to the load are adj-ustably secured at any desired postion on each boom stick on I opposite sides of the middle line between the two. The tortional moment imposed on the boom by the. resultant of the liftin line pressure on opposite sides of the mid e line 1s thus met by a wide base connection to the spar pole.

Again, the lifting lines which pass around these sheaves on the transverse members of the boom, instead of being connected to the single hauling line from the drum of the hauling engine, between the boom and the sheave on the spar pole, pass over separate and independent sheaves on opposite sides of the spar pole, and are connected to the single hauling line between the spar pole and the"drum of the hauling engine, sothat any desired range of haul of the logs to the boom i may be provided for by moving the hauling engine out the required distance from the spar pole.

Themeans by which these ideas are practically. carried out are fully set forth in the following specification, reference being made to the drawings by which it is accompanied, in which Figure 1 is a side elevation of the boom.

Fig 2, a plan of the same.

Fig. 3, a cross section on the line 3-3 in Fig. 2, and

Fig. 4 is an elevation to a reduced scale showing the lines connecting the boom to the spar pole and donkey engine, and

Fig. 5 is a plan of the same-.- 3

In these drawings'2 represents the spar pole, for which purpose a standing tree, if available, is preferably selected. The boom, which, in conjunction with the spar pole, forms the principal feature of this'in'vention, is constructed of two boom sticks 5' which are secured parallel to one" another double at the required distance apart in a horizontal plane by a distance member 3 at the end adjacent the spar pole. This member 3 is holsection of the boom stick and has an end across the arc of the hollow to support the sticks against endwise movement. Toward the outer end the boom sticks are mainby line 11 connected from a fixed strap or clamp 12 secured to the spar pole a short distance above the boom to each boom stick on each side of the spar pole. The outer end of the boom is carried by a line from. toward the upper end of the spar pole to the extreme outer end of each boom stick. The transverse members 6 are spaced apart such a distance as will effectually check swinging f the log about a vertical axis and insure th t each lifting rope will receive afair proportion of the weight. For general purposes y will be about fourteen feet apart.

lifting lines 16 by which the load is wn from the log pile and lifted for transference to the loading platform or direct to a car on the track are connected to the 2i by slings or tongs and pass through sheaves 20 connected to the shackles 9 on each transverse member 6. The position of the shackles 9 on each side of the middle line of the boom 5 5 will be such as will normally suspend the log immediately over and parallel to the track, the different apertures 8 aifording means for adjustment of this angle of normal suspension as required.

The lines 16 pass over separate sheaves 18, one on each side of the spar pole and there after are connected to the line 17 from the drum 13 of the hauling engine at a sufficient distance from the spar pole as to permit the required range of movement of the log lift ing lines 16.

Further connections may require to be made to the boom to normally return it to the loading position over-the car on the track 20, and for pulling the boom away from this normal position to the position from which the logs tire to be lifted. Means may also be provided-A for counterwcighting the lifting lines 16 to insure that they will fall through the sheaves 10 when required. These sup-' plenlentary connections are not material to this application and need not therefore be illustrated or further described.

It will be noted that the manner of suspension of the inner or spar pole end of the no u imposes a normal tendency on it to be f'imrUld when the suspension lines 11 and 15 are straight between their connections to spar pole and boom, and this condition should exist when the boom end is over the track.

The essential feature of the invention lies in the construction of the boom 5 with its two boom sticks held four or five feet apart by the member 3 which pivots on the spar pole 2, and at the other end by the transverse members 6, 7 to which the lifting line sheaves 10 are connected at any desired posi tions on opposite sides of the middle line between the two boom sticks: Also in the connection of the lifting lines 16 to the single line 17 from the drum 13 of the hauling engine, between that engine and the spar pole to which features substantial advantages are attributable in a stronger and better working boom and a greater range.

Having now particularly described my invention, I hereby declare that what I claim as new and desire to be protected in by Letters Patent, is: v I

1. A log loading boom, comprism the combination with an upright spar p0 e, of a boom horizontally suspended therefrom to be susceptible of pivotal movement around the spar pole, said boom consisting of two boom sticks horizontally spaced apart by a distance piece at one end which is hollowed out to fit the spar pole and toward the other end by spaced apart transverse members, a sheave connected to each transverse member on opposite sides of the middle lines between the boom sticks through which sheaves divided lifting lines from the hauling engine pass for connection to the log.

2. A log loading boom, comprising the combination with an upright spar pole, of a boom horizontally suspended therefrom and susceptible of pivotal movement around the spar pole, said boom consisting of two timbers horizontally spaced apart by a distance piece at one end which is hollowed out to fit the spar pole and toward the other end by transverse members secured to the undersides of the boom sticks, said transverse members having provision for connection of sheave blocks to them at variable distances on each side of themiddle bet"-'ee'n the two boom timbers, and load lifting lines connected to a line from the drum of the hauling engine, said lines passing through a sheave on each side of the spar pole and around the sheave on the transeverse members of the boom.

3. A log loading boom, comprising theh combination with an upright spar pole, of a boom horizontally suspended therefrom to be susceptible of pivotal movement around the spar pole, said boom having transverse frames near the outer end with provision for connection of a sheave to each transverse" frame on opposite sides of the middle line of the boom, and. a load lifting line taking around each sheave on the transverse mem bers of the boom and around sheaves on the same sides of the spar pole the two lines being connected to a single line from the drum of the hauling engine between the spar pole sheaves and the hauling engine reel.

4. A log loading boom, comprising the combination with an upright spar pole, of a boom horizontally suspended therefrom and susceptible of pivotal movement around it, said boom consisting of timbers horizontally spaced apart on each side of the spar pole by a stanee piece at one end which is hollowed to fit the spar pole and has provision for retaining it thereagainst and toward the other end by transverse members secured to the undersides of the boom timbers, sheave blocksconnected to the. trans- ,verse members on opposite sides of the middle line of the boom, the suspension of the boom from the spar pole being by short lines connected to each boom stick adjacent the spar pole and by lines from the upper end of the spar pole connected to the outer end of each boom stick, and log lifting lines connected to a line from the drum of the hauling engine and taking over sheaves on each side of the spar pole and around the sheave on each transverse member of the boom.

In testimony whereof I efiix my signature.

ANDREW OPSAL. 

